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不同类型流变改性剂对水泥净浆性能的影响

作者:任景阳1,李晓庭2,陈健1,高南箫1,乔敏1,冉千平1,3

关键字:不,同类型,流变,改性剂,对,水泥,净浆,性能,的,

 
(1.江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,江苏 南京  211103;2.上海建工材料工程有限公司,上海  200126;3.东南大学 材料科学与工程学院,江苏 南京  211189)
    摘要:选取5种不同类型的聚合物流变改性剂,分别属于天然聚合物、改性天然聚合物、人工合成聚合物。通过评价它们在水泥净浆中的吸附性,及其对净浆流动度、泌水、流变性的影响,系统讨论了不同流变改性剂在水泥净浆中的构效关系和作用机理。结果表明,流变改性剂中的负电荷单体在水泥颗粒表面发生吸附,在不同水泥颗粒之间起到桥接作用,负电荷单体和非离子单体共同对水泥浆体产生了影响。
    关键词:流变改性剂;水泥净浆;吸附;流动度;泌水;聚合物
    中图分类号:TU528.042        文献标识码:A        文章编号:1001-702X(2021)02-0023-04
 
Effects of different viscosity modifying admixtures on the properties of fresh cement pastes
REN Jingyang1,LI Xiaoting2,CHEN Jian1,GAO Nanxiao1,QIAO Min1,RAN Qianping1,3
(1.State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co. Ltd.,Nanjing 211103,China;2.Shanghai Construction Material Co. Ltd.,Shanghai 200126,China;3.School of Material Science and Engineering,Southeast University,Nanjing 211189,China)
    Abstract:In this work,five different viscosity modifying admixtures(VMAs) including natural polymer, semi-synthetic poly-mers,and synthetic polymers were selected and compared. The adsorption,fluidity,bleeding and rheological properties of the cement pastes mixed with different polymers were tested,respectively. The structure-property relationships and action mechanism of the polymers in cement pastes were fully discussed. The results indicate that the anionic monomers of the polymers can adsorb on cement surface and lead to particle-particle bridging,and both the anionic and nonionic monomers effect on the properties of cement paste cooperatively. 
    Key words:viscosity modifying admixtures,cement paste,adsorption,fluidity,bleeding,polymers